Transputer performance issues using the trollius operating system
Authors: Beers, James R. Jr., Leibensperger, Ros, Braner, Moshe, Fielding, David
The Trollius Opeiating System for distributed multicomputer offers different types of message-passing services, incorporating different amounts of overhead. Each of the operating system activities required for interprocess communication is designed as an individual module or layer. The different types of Trollius communication can be accessed by turning operating system services on or off, or by directly utilizing different layers of communication.Basically, there are three layers of internode communication. The network layer can be used from any node to any other node; the data link layer is for nearest-neighbor communication; and Ihe physical layer uses the hardware in the most efficient way possible, but requires exclusive use of the link. A separate level, the kernel level, is used for intranode communication. Operating system services that can be turned on or off include buffering and virtual circuits.Two different types of benchmarks are used to evaluate the performance of the different types of Trollius message-passing. The first type calculates message-passing lime as the sum of the limes required for each individual service or component of Ihe process. The decrease in message-passing lime obtained when turning off services can ihus be easily measured. The second benchmark measures throughput, the amount of information that can be sent from one node to another in a given amount of time, for different layers of message-passing, utilizing different sendees. This is the more accurate measure when series of messages are sent from one node to another. The throughput measurements demonstrate the value of the physical layer and of virtual circuits.
OUG-13: Real-Time Systems with Transputers, Hussein S. M. Zedan, 1990, pp 35 - 50 published by IOS Press, Amsterdam
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